Department of Radiology, Weill Cornell Medical College, New York, New York, USA. Department of Biomedical Engineering, Ithaca, New York, USA. Department of Physics, East China Normal University, Shanghai, P.R. China. Department of Radiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science & Technology, Wuhan, P.R. China. Department of Biomedical Engineering, University of Alberta, Edmonton, AB, Canada. Division of Cardiology, Department of Medicine, Weill Cornell Medical College, New York, New York, USA. RadNet, Inc., Los Angeles, CA, USA. Department of Radiology, Yueyang Hospital of Integrated Traditional Chinese & Western Medicine, Shanghai, P.R. China. Department of Neurology, the Second Affiliated Hospital of Zhejiang University, School of Medicine, Hangzhou, P.R. China. Department of Neurosurgery, Mount Sinai Hospital, New York, New York, USA. Department of Neurological Surgery, Weill Cornell Medical College, New York, New York, USA. Department of Medical Pharmacology, University of Lille, Lille, France. Department of Neurology and Movement Disorders, University of Lille, Lille, France. Department of Toxicology, Public Health and Environment, University of Lille, Lille, France. INSERM U1171, University of Lille, Lille, France. Department of Radiology, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan. Department of Neurology, Penn State University-Milton S. Hershey Medical Center, Hershey, Pennsylvania, USA. Department of Pharmacology, Penn State University-Milton S. Hershey Medical Center, Hershey, Pennsylvania, USA. Department of Neurosurgery, Penn State University-Milton S. Hershey Medical Center, Hershey, Pennsylvania, USA. Department of Radiology, Penn State University-Milton S. Hershey Medical Center, Hershey, Pennsylvania, USA. Department of Radiology, School of Medicine, University of Occupational and Environmental Health, Kitakyushu, Japan. Department of Neurology, Hospital for Special Surgery, New York, New York, USA. Parkinson's Disease and Movement Disorder Institute, Weill Cornell Medical College, New York, New York, USA. Department of Radiology, Kyung Hee University Hospital at Gangdong, College of Medicine, Kyung Hee University, Seoul, South Korea. Department of Neurology, Department of Neurology, Keck School of Medicine of the University of Southern California, Los Angeles, California, USA. Department of Neurology and Neuroscience, Weill Cornell Medical College, New York, New York, USA. Department of Neurology, School of Medicine, Yale University, New Haven, Connecticut, USA. Oxidation Biology Unit, Florey Institute of Neuroscience and Mental Health, University of Melbourne, Parkville, Victoria, Australia. Department of Pediatrics, Columbia University, Children's Hospital of New York, New York, New York, USA.